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AWS Public IP Address Ranges Now Available in JSON Form

Many of our customers have asked us for a detailed list of the IP
address ranges assigned to and used by AWS. While the use cases
vary from customer to customer, they generally involve firewalls and
other forms of network access controls. In the past we have met
this need by posting human-readable information to the EC2, S3, SNS,
and CloudFront Forums.

IP Ranges in JSON Form
I am happy to announce that this information is now available in
JSON form at
https://ip-ranges.amazonaws.com/ip-ranges.json.
The information in this file is generated from our internal system-of-record and is authoritative. You can
expect it to change several times per week and should poll accordingly.

Here are the the first couple of lines:

{
  "syncToken": "1416523628",
  "createDate": "2014-11-20-22-51-01",
  "prefixes": [
    {
      "ip_prefix": "50.19.0.0/16",
      "region": "us-east-1",
      "service": "AMAZON"
    },
    {
      "ip_prefix": "54.239.98.0/24",
      "region": "us-east-1",
      "service": "AMAZON"
    },

Valid values for the service key include “AMAZON”, “EC2″,
“ROUTE53″, “ROUTE53_HEALTHCHECKS”, and “CLOUDFRONT.” If you need to know all
of the ranges and don’t care about the service, use the “AMAZON” entries. The
other entries are subsets of this one. Also, some of the services, such as
S3, are represented in “AMAZON” and do not have an entry that is specific to
the service. We plan to add additional values over time; code accordingly!

For more information, read the documentation on
AWS IP Address Ranges.

Jeff;

PS – By my count, there are now 10,130,200 IP addresses in the EC2 range. My code excludes the first (all zeroes)
and last (all ones) address in each CIDR block.

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